OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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design arrangement and method of gun movement control are d1-stinctive
new features. Each installation comprises duplicate
sight stations located right and left , respectively, of the
wing guns, above the shelf plate and enclosed in sight station
compartments which provide flameproof isolation from the gun
compartments and other turret divisions. Each sight station
includes sight pointer1s telescope, sight trainer1s telescope
and sight setterls indicator. These are arranged in a system
of sight movement indicating and transmi tting shafts and sight
handwheel drives that positions the lines of sight, interconnects
the like elements of the two sight stations and extends
to indicators at each gun layer and gun train operator station.
The shaft system of brackets, gearing, shafts, clutches, and
connected .par t.s and the elements of the right sight station
comprise one assembly, designated l6-inch Sight, Mark 4; the
elements of the left sight station comprise l6-inch Sight,
Mark 4, Mod. 1. The schematic diagram .of plate 15 shows the
arrangement. Symbols used on the diagram are standard fire
control symbols as defined in 0.D.3447.
7. The ar-r-angement. of these assemblies is such that
the elements of either station when clutched to the shaft system
comprises a complete sight. The elements of the other
station:, disconnected from the shaft system; comprise a standby
station which maybe quickly synchronized to take over sight
oper-at Lon , Both stations function alike, directly in train
and by gun order in elevation, positioning the guns with reference
to the target. This is accomplished by sight- setter
movement of the Li.ne s of sig.ht according to sight angle and
deflection orders and by pointer arid trainer handwheel'maniprilation
holding cros~-wires ort the target.
8. The arrangement of the sight within the turret corresponds
generally to the loca t i.on of the telescope 0bj ecti ve.
The components of the duplicate arrangement are practically
symet.rLcaL about the longitudinal center line of the turret,
the center of telescope objectives being right and left of the
center line of the turret, pointerls 231.25 inches and trainerls
225.25 inches. The center of the pointer1s telescope is
44.0 inches above the shelf plate and 5 .0 inches above the center'line
of 'trunnions. The center of the trainer1s telescope
is 80.0 inches above the shelf plate and 36.0 inches above the
center line of' trunnions. The fore and aft location of the
center lines of the telescopes is, trainer1s 32.0 inches forward,
and pointer I s 24.0 inches rearward of the transverse center
line of the turret. Shafts from these stations extend
through the shelf plate to brackets on the circular girder above
the pan floor; thence obliquely forward to cross shafts
running transversely through the turret to connect the two sight
assemblies. Fromcross shaft brackets, shafts extend into the